u-boot/doc/README.nand-boot-ppc440

2 NAND boot on PPC440 platforms
5 This document describes the U-Boot NAND boot feature as it
8 The PPC440EP(x)/GR(x) cpu's can boot directly from NAND FLASH,
9 completely without NOR FLASH. This can be done by using the NAND
10 boot feature of the 440 NAND flash controller (NDFC).
16 Will load first 4k from NAND (SPL) into cache and execute it from there.
20 Will load special U-Boot version (NUB) from NAND and execute it. This SPL
22 controller and the NAND controller so that the special U-Boot image can be
23 loaded from NAND to SDRAM.
26 c) NUB (NAND U-Boot)
28 This NAND U-Boot (NUB) is a special U-Boot version which can be started
31 On 440EPx the SPL is copied to internal SRAM before the NAND controller
33 the NAND controller.
36 Example: Build and install NAND boot image for Sequoia (440EPx):
38 a) Configure for sequoia with NAND boot support:
46 Also another image is created spanning a whole NAND block (16kBytes):
48 The main NAND U-Boot image is generated in the toplevel directory:
53 This image should be programmed at offset 0 in the NAND flash: